EM73P361AH Ver la hoja de datos (PDF) - ELAN Microelectronics
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EM73P361AH Datasheet PDF : 36 Pages
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EM73P361A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
the COM pins are inactive and the SEG pins continously output the display data. When LDC is 11, the LCD
driver enables, the power swich is turned on and it cannot be turned off forever except the CPU is reseted or
sleeping. Users must enable the LCD driver by self when the CPU is waked up.
Port27 3 2 1 0
Initial value : 0000
LDC DUTY
LDC
00
01
10
11
LCD display control
LCD display disable & change duty
Blanking
Reserved
LCD display enable
DUTY
00
01
10
11
Driving method select
Reserved
1/3 duty (1/2 bias)
1/2 duty (1/2 bias)
Static
LCD driving methods
There are four kinds of driving methods can be selected by DUTY (P27.0~P27.1). The driving waveforms of
LCD driver are as below :
CC C
OO O
MM M
01 2
SEG0
SEG1
SEG2
:
COM0
COM1
COM2
SEG0
1/3 duty (1/2 bias)
1/2duty (1/2 bias)
Static
ON OFF
SEG0-COM0
ON
SEG0-COM1
OFF
Frame
Frame
Frame
LCD Frame frequency : According to the drive method to set the frame frequency.
Driving method
1/3 duty
1/2 duty
Static
Frame frequency (Hz)
43 x (3/3) = 43
43 x (3/2) = 64
43
The relation between LCD display data and driving method
Driving method
1/3 duty
1/2 duty
Static
bit3
bit2
bit1
bit0
-
COM2 COM1 COM0
-
-
COM1 COM0
-
-
-
COM0
LCD drive voltage
EM73P361A provides 2 kinds of LCD bias methods, capacitor divider and resistor divider, when the LCD bias
method is capacitor divider,the VA is connected a capacitor to VB and the VEE is connected a capacitor
to VSS. The output of VEE is 1.5V for LCD bias voltage. When the LCD bias method is resistor divider, the
VEE is floating.
* This specification are subject to be changed without notice.
12.17.2001 18
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